Source: sim/geometry/Districts.js

  1. /** @module */
  3. import makeGeography, { makeTracts, updateCensus, updateDistricts, updateVotersByDistrict, updateVotersByTract } from '@paretoman/votekit-make-geography'
  5. /**
  6.  * @constructor
  7.  */
  8. export default function Districts(voterShapeList, changes, electionOptionsMan, simOptions) {
  9.     const self = this
  11.     self.init = () => {
  12.         const optionsBag = electionOptionsMan.getOptions()
  13.         const { numTracts, numDistricts } = optionsBag
  14.         const { dimensions } = simOptions
  15.         const voterGeoms = voterShapeList.getGeoms(dimensions)
  16.         self.geography = makeGeography(numTracts, numDistricts, voterGeoms, dimensions)
  17.     }
  19.     let firstRun = true
  21.     // Update call from sim //
  22.     self.update = () => {
  23.         if (changes.checkNone()) return
  25.         if (firstRun) {
  26.             firstRun = false
  27.             self.init()
  28.             return
  29.         }
  31.         const optionsBag = electionOptionsMan.getOptions()
  33.         if (changes.check(['numTracts'])) {
  34.             const { numTracts } = optionsBag
  35.             self.geography = makeTracts(self.geography, numTracts)
  36.         }
  38.         if (changes.check(['numDistricts'])) {
  39.             const { numDistricts } = optionsBag
  40.             self.geography = updateDistricts(self.geography, numDistricts)
  41.         }
  43.         if (changes.check(['numDistricts', 'numTracts'])) {
  44.             self.geography = updateCensus(self.geography)
  45.         }
  47.         if (changes.check(['voters', 'dimensions', 'numTracts'])) {
  48.             const { dimensions } = simOptions
  49.             const voterGeoms = voterShapeList.getGeoms(dimensions)
  50.             self.geography = updateVotersByTract(self.geography, voterGeoms, dimensions)
  51.             // todo: maybe make this only trigger when voters change
  52.         }
  54.         if (changes.check(['voters', 'dimensions', 'numTracts', 'numDistricts'])) {
  55.             self.geography = updateVotersByDistrict(self.geography)
  56.             // todo: maybe make this only trigger when voters change
  57.         }
  58.     }
  59. }